/*
 * Copyright (c) 2011 PonySDK
 *  Owners:
 *  Luciano Broussal  <luciano.broussal AT gmail.com>
 *	Mathieu Barbier   <mathieu.barbier AT gmail.com>
 *	Nicolas Ciaravola <nicolas.ciaravola.pro AT gmail.com>
 *  
 *  WebSite:
 *  http://code.google.com/p/pony-sdk/
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.ponysdk.ui.server.form.validator;

import com.ponysdk.ui.server.form.FormField;

public class EmailFieldValidator implements FieldValidator {

    private static final String EMAILS_SEPARATOR = ";";

    private static final String VALID_MAIL_REGEX = "^[a-z0-9._-]+@[a-z0-9.-]{1,}[.][a-z]{2,3}";

    private static final String INVALID_CHARACTERS_MSG = "Contains invalid characters.\n Allowed characters " + VALID_MAIL_REGEX;

    @Override
    public ValidationResult isValid(FormField field) {

        final String text = (String) field.getValue();
        if (text == null || text.isEmpty()) { return ValidationResult.newOKValidationResult(); }

        final String[] emails = text.split(EMAILS_SEPARATOR);
        for (int i = 0; i < emails.length; i++) {
            if (!emails[i].matches(VALID_MAIL_REGEX)) { return ValidationResult.newFailedValidationResult(INVALID_CHARACTERS_MSG); }
        }

        return ValidationResult.newOKValidationResult();
    }

}
